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vacuum readings
#84768 10/25/2007 9:25 PM
Joined: Sep 2007
Posts: 24
southeast usa
B
bobshollow
Offline
Apprentice
bobshollow
Apprentice
B Offline
Joined: Sep 2007
Posts: 24
southeast usa
I've got a 235 with fenton intake with 2 one barrel rochesters. What should the vacuum reading be with engine at idle? thanks
Re: vacuum readings
#84769 10/26/2007 12:59 AM
Joined: Apr 2005
Posts: 275
Ariz. desert
D
desertdog Offline
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desertdog
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Joined: Apr 2005
Posts: 275
Ariz. desert
Take a look at http://www.centuryperformance.com/vacuum.asp It explains pretty well the various conditions. If you have a hi-perf. cam be aware your vac. will be lower than stock at idle due to valve overlap.
Doug

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Re: vacuum readings
#84770 10/27/2007 2:50 AM
Joined: Feb 2000
Posts: 5,195
Lee's Summit Mo. 64086
J
Joe H Offline
'Bolter
Joe H
'Bolter
J Offline
Joined: Feb 2000
Posts: 5,195
Lee's Summit Mo. 64086
My 250 with three one barrels has 19.5" @ idle. The amount of carbs should not change the vacuum. One or three, it will be the same. I would bet a stock 235 will be in the 18 to 20 range depending on the valves and ring condition. A bigger cam will lower it like Desertdog mentioned, could be as much as 2 to 3 inches lower. Timing can also raise or lower it a bit. Joe

1937 Chevrolet Inline-powered Streetrod

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